Originally posted by 740 turbo brick
So just to be clear, can I use one IAT and CLT and tap into the signal for MS, or do I need to get another set of temp sensors dedicated to the MS unit?

Unfortunately you need dedicated sensors. The stock PCM uses multiple bias resistors, which the MegaSquirt ECU can't handle (not necessarily a good or a bad thing, it's just how it is).

If you have an MS2 ECU, the second set of sensors can be 420A/Chrysler sensors or GM sensors; they're both just as easy to calibrate in TunerStudio MS.